BSNL Broadband
Disconect problem due to incoming and out going call and noicing problem in telephone

I am suffring from telephone noicing problem. when my broadband conected and i am work on it and if comes call and hav to do call then i hav to do switch off my broadband after that i can receive my call and call to another without noincing problem. wat should i do. i hav to informed bsnl offics shahdol m.p. they not solving my problem plz solve my problem bcoz its a state goverment department and with this problem we are effected and dont do our work properly. its my porsonely request plz solve our problem.